Muffler.



PATENTLD BPT. 2'7, 1904.

W. J. HEWITT.

MUFFLER.

APPLICATION FILED MAR. 22, 1904.

N0 MODEL.

M/ V E N TO WZZ'ain J m'ii & E M E N 1 W ATTOR Patented September 27, 1904.

UNITED STATES PATENT OFFICE,

\VILLIAM JOHN HEWITT, OF DEL MONTE, CALIFORNIA.

MUFFLER.

SPECIFICATION forming part of Letters Patent N 0. 771,070, dated September 27, 1904.

Application filed March 22, 1904. Serial No. 199,422. (No model- To a 1071 0772, it 77204 concern.-

Be it known that I, IVILLIAM J OHN HEWITT, a citizen of the United States, and a resident of Del Monte, in the county of Monterey and State of California, have invented a new and Improved Muffler, of which the following is a full, clear, and exact description.

My invention relates to devices for muffiing the exhaust from engines and the like, being particularly adapted for use in connection with explosive-engines. Its principal object is to generally improve the efficiency of such devices.

' It consists in the various features and combinations hereinafter described and claimed.

Reference is to be had to the accompanying drawings, forming a part of this specification, in Which similar characters of reference indicatecorresponding parts in both figures.

Figure l is a central vertical longitudinal section through one embodiment of my invention, and Fig. 2 is a side elevation of one of the series of blades.

10 designates a casing, preferably of elongated cylindrical form and having at its opposite ends removable portions or heads 11 11. Near the junctures of the cylindrical with the end portions are provided inlet and outlet pipes or passes 12 and 13, respectively. Ex-

tending through the casing is a shaft or supporting member 14E, having upon its threaded ends bearing-collars 15, which,with the ends of sleeves 15, projecting from the portions 11 11 of the casing, form ways in which operate series of balls 16, permitting the shaft to rotate with but slight resistance. At one end of the shaft, preferably adjacent to the outlet-opening, the thread is continued for a considerable distance at 17, and beyond this thread (here shown as situated near the center of the easing) is a collar or contact member 18, fixed to the shaft. Along the thread 17 a nut or adjustable contact member 19 may move, and between this and the fixed contact member surrounding the shaft are a series of hubs 20, carrying blades or circulating members 21. As illustrated, these blades are in the form of inclined fans and are arranged about the hubs in circular series. The hubs are preferably spaced apart from one another by a plurality of washers or collars 22, and all these hubs and collars may be forced together to rotate with the shaft by screwing down the nut 19.

whereby additional force isabsorbed, while their revolution produces a suction which tends to draw out the burned gases or the like from the exhaust-valve and considerably decreases the back pressure, thereby increasing the speed of the engine. The exhaust is now discharged through the outlet-passage with hardly audible sound. It will be seen that by creating a draft from the exhaust-passage the eiiiciency of the engine to which it is applied will be increased and a greatly-enhanced mufiiing effect obtained by the contact of the exhaust with the moving blades and that this may be adjusted by changing the position of the circulating members. If it is desired, said members may be so positioned upon the shaft that the space between them gradually increases as they approach the outlet, thus giving the gas -a better opportunity to expand.

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. A mufiier comprising a casing provided with inlet and outlet passages, circulating means within the casing, and means for moving said circulating means.

2. A muffler comprising a casing provided with inlet and outlet passages, circulating means within the casing, means for rotating said circulating means.

3. A muffler comprising a casing provided with inlet and outlet passages, a plurality of circulating members movable within the easing, and means for varying the relation between said members.

4. In a muffler, the combination with a casing provided with inlet and outlet passages, of a shaft extending into the casing, blades mounted upon the shaft, and means for applying power to the shaft to revolve the blades.

5. In a muffler, the combination with a casing provided with inlet and outlet passages, of a shaft extending into the casing, a circular series of blades mounted upon the shaft, and means for applying power to the shaft to revolvethe blades.

6. In a muffler, the combination with a casing provided with inlet and outlet passages, of a shaft extending into the casing, means for rotating the shaft,and a plurality of blades mounted at intervals along the shaft.

7. In a muffler, the combination with a casing provided with inlet and outlet passages, of a shaft extending into the casing, a plurality of blades mounted at intervals along the shaft, and means for varying the distance between the blades.

8. In a muffler, the combination with a casing provided with inlet and outlet passages, of a shaft extending into the casing, means for rotating the shaft, and a plurality of circular series of blades fixed to the shaft.

9. In a muffler, the combination with a casing provided with inlet and outlet passages, of a rotatable shaft extending into the casing, hubs surrounding the shaft, blades projecting from the hubs, collars interposed between the hubs, and means for forcing the hubs and collars together.

10. The combination with an elongated casing having near its opposite ends inlet and outlet passages, of a shaft journaled at the ends of the casing and extending therethrough, means for rotating the shaft, and blades mounted upon the shaft at one end of the casing ad jacent to the outlet-passage.

11. The combination with an elongated casing having near its opposite ends inlet and outlet passages, of a shaft journaled at the ends of the casing and extending therethrough, said shaft being provided between its ends with a fixed collar and a thread at one side thereof, hubs surrounding the shaft, blades projecting from the hubs, and a nut operating upon the threaded portion of the shaft and serving to force the hubs toward the collar.

12. The combination with an elongated casing having near its opposite ends inlet and out- I/VILLIAM JOHN HEWITT.

Witnesses:

GEO. WV. MEssE, WILLIAM RAY, J r. 

